How to batch import Wavefront OBJ files?
Unfortunately, this is not possible by default with Blender 2.5x+ it seems. In 2.49, you could hold Shift then press the Import Obj button and it would prompt you to select a directory with the sequence.

In 2.69, you can do the same with a script &mdash; it could be converted into a more usable utility but it works.

import os
import bpy

# put the location to the folder where the objs are located here in this fashion
# this line will only work on windows ie C:\objects
path_to_obj_dir = os.path.join('C:\\', 'objects')

# get list of all files in directory
file_list = sorted(os.listdir(path_to_obj_dir))

# get a list of files ending in 'obj'
obj_list = [item for item in file_list if item.endswith('.obj')]

# loop through the strings in obj_list and add the files to the scene
for item in obj_list:
    path_to_file = os.path.join(path_to_obj_dir, item)
    bpy.ops.import_scene.obj(filepath = path_to_file)


For unix machines the direct path should look like:

# location of obj folder
path_to_obj_dir = '/home/user/Desktop/objects/'